Abstract Class in Acceleo Transformation

how to show the abstract class in generate.mtl file of Accelo transformation into java. Currently, I am writing this code but it's not working...

[if (aClass.isAbstract=true)]
public abstract class [aClass.name.toUpperFirst()/]

[if (aClass.isAbstract=false)]
public class [aClass.name.toUpperFirst()/]
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